[Bug 680917] New: Inconsistent notify::volume emitting between Linux & Mac OS X

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=680917
  GStreamer | don't know | 0.10.36

           Summary: Inconsistent notify::volume emitting between Linux &
                    Mac OS X
    Classification: Platform
           Product: GStreamer
           Version: 0.10.36
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: timo+gnome at latecrew.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=219994)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=219994)
minimal testcase to reproduce, compiles on both platforms

I found that there is inconsistent behavior of the notify::volume signal in the
playbin2 object between OS X and Linux. For better explanation, I could create
a reproducible minimal test-case which is attached and compiles on both
platforms.

On OS X, the callback in the test-case is never called, hence no output. Same
program run on Linux will have the callback called twice. Note, that no volume
is changed by the program at all. On Linux the notify::volume signal is called
upon playback start, but not on OS X.

I don't know what is correct behavior here, but there should be a consistent
one, same on all platforms: Either have notify::volume triggered once upon
playback start, or don't have it started but only on real volume changes.

I would vote for having the notify::volume signal emitted upon playback start -
we have used it in banshee which works fine on Linux to set the GUI volume
information upon playback start. But this resulted in a bug when running
banshee on OS X (thats how I found this bug, see banshee's bug report here:
https://bugzilla.gnome.org/show_bug.cgi?id=660012).

Tested systems were an  Ubuntu 12.04 with shipped gstreamer (0.10.36), and OS X
Lion with compiled gstreamer 0.10.36 from source, using stock compiler on both
plattforms.

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